Koradan was a male Klingon and head of the House of Varnak in the 24th century. He was the mate of B'Ettak and the father of Eral.
When his daughter bore a son by one of their house servants, Koradan had Eral exiled from their house without honor, as he could not bear to kill her, as honor dictated. He also had the infant handed over to a cousin.
Koradan supported Morjod during his attempted coup in 2375. When Martok defeated his usurper, he dissolved the House of Varnak and had all its members, including Koradan, put to death. (GKN novel: A Good Day to Die; KE novel: A Burning House)